Add a way to run a beforeEach before all other beforeEachs in the test. #1294

It would be nice to have a way to a beforeEach that runs before the beforeEachs defined earlier than the other beforeEachs in a test. Something like this:

beforeEach {
    // this runs second
}

describe("a nested example group") {
    beforeAll {
        // This runs before that outer beforeEach
    }
}

Basically, I want the opposite of justBeforeEach.

I'm not too sold on beforeAll, because it could be confused with beforeSuite. But it does get the idea across.